Playground Spinner Clamshell

A playground near my house has a feature where kids can spin some squares like monochrome pixels on 1/2" rods, but a bunch of them are broken off. I found one of the clamshell pieces (which mate with an identical piece because that's logistically simpler), so I modeled a replacement part. They are two-tone, so I'll just print a couple batches in different resins, or maybe get some dye and try to color match (white and brown).

BETA - not yet tested. I will also try to find the playground maker information.